I would love to lock my weapons, but I won't, because I'm far too terrified of accidentally de-equipping them in the process of locking them.
I spent a crazy amount of time equipping them, and since then, I don't even move my mouse near the wear window for fear that I might twitch and throw all that time away.
Locking them would be perfect, but I really shouldn't have to right click the item to do it. I don't know what'll happen when I right click them, will I not hold it down long enough and it'll de-equip? Will the server lag somehow and it'll de-equip anyway? Will I hit the wrong menu item?
My point is, making the user press the same button that de-equips in order to lock the item is really a bad idea. You know someone will accidentally de-equip the very item they're terrified of accidentally de-equipping.
Please, move it to the upper left info menu, have a menu for lock item that pulls out with a list of the equipment slots, and let us check the ones we want to lock.